Comparative Analysis of All-Sky Luminous Efficacy Models Based on Calculated and Measured Solar Radiation Data of Four Worldwide Cities

Figure 1

Scatter plotting of global solar radiation and luminous efficacy models performance for Lyon, France (1994).

(a) Solar irradiance—Z&H model (MBE: 0.3%, RMSE: 27.3%)

(b) Illuminance—Perez model (MBE: 1.2%, RMSE: 26.6%)